There's a bit of bug screen and a vent on the outside, front and back of that box. The other box (Trey's Lunchbox) has some small drain holes drilled in the bottom of the back door, and in a row along the front. So far, any moisture seems to evap pretty quickly - no mildew or mold after three years... the carpet has only been in there a few months, and living in a desert probably has something to do with it...

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